CN113614004B - Container for microwave oven - Google Patents
Container for microwave oven Download PDFInfo
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- CN113614004B CN113614004B CN201980090731.0A CN201980090731A CN113614004B CN 113614004 B CN113614004 B CN 113614004B CN 201980090731 A CN201980090731 A CN 201980090731A CN 113614004 B CN113614004 B CN 113614004B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
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Abstract
A container for a microwave oven is provided to prevent the contents from scattering and to prevent the occurrence of a pop noise during heating. When a container (10) for a microwave oven is heated, steam in a content storage part (11) is discharged through a steam passage (29) formed between a first container layer (21) and a second container layer (22), a boundary exposure part (28) exposed to the content storage part (11) when the container is heated is formed on a flange part (25), and a heat sealing part (40) comprises: an annular seal portion (41); a special-shaped sealing part (42) which protrudes to the inner circumferential side from the inner circumferential edge of the annular sealing part (41); and control seal portions (43) formed on both sides of the shaped seal portion (42) in the flange circumferential direction, respectively, the shaped seal portion (42) being formed such that: when viewed from above, the inner peripheral edge of the control seal portion reaches or approaches the boundary exposed portion (28), and the control seal portion (43) faces the irregular seal portion (42) in the flange circumferential direction so as to sandwich the unsealed portion (44).
Description
Technical Field
The present invention relates to a container for a microwave oven, which is configured by thermally bonding a lid body to a flange portion of a container body formed of a multilayer structure including a first container layer and a second container layer adjacent to each other through a heat seal portion, and which discharges steam in a content storage portion through a steam passage formed between the first container layer and the second container layer when heated.
Background
Conventionally, there is a market for a packaged food in which a lid body is thermally bonded to a flange portion of a container body through an annular heat seal portion, and a cooked or half-cooked food is contained in a container for a microwave oven, and the food is heated and cooked in the microwave oven when the food is eaten.
In such a container for a microwave oven, when cooking is performed in a microwave oven, the internal pressure of the container for a microwave oven is increased due to thermal expansion of steam or internal air generated from food, and the container for a microwave oven is broken or deformed, and there is a possibility that food stored in the container for a microwave oven is broken and scattered.
Therefore, as one of the methods for preventing the container for a microwave oven from being cracked or deformed, there is a method in which a hole is formed in the container for a microwave oven in advance by a pointed article or an end portion of the container for a microwave oven is cut by scissors, a kitchen knife, or the like before the microwave oven is used for cooking, thereby releasing the internal pressure of the sealed container.
However, the above method requires a lot of time and effort, and the steam generated from the start of cooking is immediately released to the outside of the container for microwave oven, so that the steam causes a problem of deterioration in the heat-steaming effect and deterioration in the taste.
In order to solve the above-described problems, there has been proposed a method of making a heat-sealed portion of a container for a microwave oven easily peelable, and making the shape of the heat-sealed portion into a shape so that, when cooking is performed in the microwave oven, a part of the heat-sealed portion where a flange portion and a lid body are thermally bonded is peeled off by an increase in internal pressure due to steam generated in food or expansion of air or the like in the sealed container, and the peeled portion is used as a steam passage to release the internal pressure of the container for the microwave oven (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. H09-221177
Patent document 2: japanese patent laid-open No. 2000-62858
Patent document 3: japanese patent laid-open publication No. 2017-171329
Disclosure of Invention
However, in the container for a microwave oven as described in patent document 1, when air or steam generated from food after volume expansion in the container for a microwave oven returns to a normal state after heating and cooking, that is, when the temperature of the container for a microwave oven after heating is lowered to a normal temperature, a part or all of a steam passage opened during cooking is blocked, and the inside of the container for a microwave oven is in a reduced pressure state, and the container for a microwave oven is deformed in some cases, and as a result, the appearance of the container for a microwave oven is deteriorated and it is difficult to take out the food after heating and cooking.
As a means for preventing the above-described blockage of the steam passage, as disclosed in patent document 2, there is also considered: the top surface of the flange portion is formed with 1 or more projections, etc., thereby preventing the lid body from being in close contact with the flange portion.
However, in the container for a microwave oven of patent document 2, since it is necessary to form 1 or more convex portions on the upper surface of the flange portion, the manufacturing cost of the container for a microwave oven increases, and in addition, in order to form the convex portions, it is necessary to design the radial width of the flange portion to be large, and the formation of the convex portions may affect the thermal adhesiveness between the lid body and the flange portion.
In order to solve the above problems, the present applicant has proposed a container for a microwave oven in which a flange portion formed of a multilayer structure including a first container layer and a second container layer is formed with a boundary exposed portion which is a boundary between the first container layer and the second container layer, and steam in a content storage portion is discharged through a steam passage formed between the first container layer and the second container layer when heating is performed in the microwave oven (see patent document 3). In the container for a microwave oven described in patent document 3, since the arch-shaped deforming portion for deforming at least one of the first container layer and the second container layer into the arch shape can be formed by the pressure and heat of the steam passing through the steam passage formed between the first container layer and the second container layer when the container for a microwave oven is heated, even when the temperature of the container for a microwave oven is lowered after the container for a microwave oven is heated, the arch-shaped deforming portion can prevent the steam passage from being closed, and thus, the container for a microwave oven can be prevented from being deformed by introducing the outside air into the container for a microwave oven.
However, in the container for a microwave oven described in patent document 3, when the container is heated in the microwave oven, the separation between the first container layer and the second container layer progresses outward in the flange radial direction due to the pressure rise in the content housing portion, and thus a steam passage for discharging steam to the outside is formed. If such an unexpected expansion of the steam passage occurs, there is a possibility that the contents may be scattered or a pop sound may be generated when the steam is ejected to the outside.
Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a container for a microwave oven, which has a simple structure and prevents contents from scattering or a pop sound from being generated when heating is performed in the microwave oven.
The present invention is a container for a microwave oven, in which a lid body is thermally bonded to a flange portion of a container body formed of a multilayer structure including a first container layer and a second container layer adjacent to each other through a heat seal portion, and steam in a content storage portion is discharged through a steam passage formed between the first container layer and the second container layer when heating, and a boundary exposed portion is formed in the flange portion, the boundary exposed portion being a boundary between the first container layer and the second container layer and being exposed to the content storage portion at least when heating, the heat seal portion including: an annular seal portion formed to surround the content storage portion when viewed from above; a special-shaped seal portion protruding from an inner peripheral edge of the annular seal portion toward an inner peripheral side; and control seal portions formed on both sides of the shaped seal portion in the flange circumferential direction, respectively, the shaped seal portion being formed of: the control seal portion is disposed so as to face the irregularly shaped seal portion in the flange circumferential direction so as to sandwich an unsealed portion where the lid body is not thermally bonded to the flange portion, and the inner peripheral edge of the control seal portion reaches or approaches the boundary exposed portion when viewed from above.
Effects of the invention
According to the present invention, the heat seal portion has: the lid body is provided with a special-shaped seal portion protruding from the inner peripheral edge of the annular seal portion toward the inner peripheral side, and control seal portions formed on both sides of the special-shaped seal portion in the flange circumferential direction, respectively, and the control seal portions are opposed to the special-shaped seal portion in the flange circumferential direction so as to sandwich an unsealed portion where the lid body is not thermally bonded to the flange portion. Accordingly, when heating is performed in a microwave oven, steam pressure is applied to the unsealed portion between the irregularly-shaped sealing portion and the control sealing portion to expand the unsealed portion, and the expansion of the unsealed portion can suppress the separation between the first container layer and the second container layer from spreading in the flange circumferential direction.
Drawings
Fig. 1 is an explanatory view of a container for a microwave oven according to an embodiment of the present invention, as viewed from above.
Fig. 2 isbase:Sub>A sectional view ofbase:Sub>A container forbase:Sub>A microwave oven, which is shown inbase:Sub>A position of linebase:Sub>A-base:Sub>A of fig. 1 as viewed inbase:Sub>A direction of an arrow.
Fig. 3 is an enlarged explanatory view of the vicinity of the boundary exposed portion in fig. 2.
Fig. 4 is an explanatory view schematically showing the case of steam removal during heating.
Fig. 5 is an explanatory view of the vicinity of the boundary exposed portion as viewed from above.
Fig. 6 is a sectional view as viewed in the direction of the arrows at the line B-B of fig. 5.
Fig. 7 is an explanatory diagram showing the vicinity of the deformed seal portion in an enlarged manner.
Fig. 8 is an explanatory diagram showing the experimental results of confirming the relationship between the seal shape and the steam removal.
Fig. 9 is an explanatory view showing various modifications of the container for a microwave oven.
Fig. 10 is an explanatory view showing various modifications of the container for a microwave oven.
Fig. 11 is an explanatory view showing a modification of the form of the boundary exposed portion.
Fig. 12 is an explanatory view showing a modification in which a through hole is formed in the flange portion.
Detailed Description
A container 10 for a microwave oven according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in fig. 1 and 2, the container 10 for a microwave oven is configured as a container for a microwave oven in which a lid body 30 is heat-sealed to a flange portion 25 of a container main body 20 by a heat-sealing portion 40, a cooked or half-cooked food is stored in a content storage portion 11, and the food is heated in a microwave oven when the food is eaten.
Hereinafter, each constituent element of the container 10 for a microwave oven will be described in detail.
First, as shown in fig. 2 and 3, the container body 20 is formed of a multilayer structure including a first container layer 21 and a second container layer 22 adjacent to each other, and in the present embodiment, 3-layer structures of the first container layer 21 as a sealant layer, the second container layer 22 as an intermediate layer (softened resin layer), and the third container layer 23 as a base layer, which are thermally bonded to the lid body 30, are formed in this order from the upper side (inner peripheral side of the body).
The first container layer (sealing layer) 21 is formed of an ethylene copolymer such as polypropylene, polyethylene, EMA (ethylene-methyl acrylate), EVA (ethylene-vinyl acetate), EMMA (ethylene-methyl methacrylate), or a mixture thereof, and preferably contains a resin having a vicat softening point (JIS K7206A method) of 100 ℃.
The second container layer (intermediate layer) 22 is formed of an ethylene copolymer such as polypropylene, polyethylene, EMA, EVA, and EMMA, or a mixture thereof, but is preferably formed of polyethylene, an ethylene copolymer, or a mixture thereof from the viewpoint of steam removability.
The third container layer (base material layer) 23 is formed of polypropylene, polyethylene, or the like, but is preferably formed of polypropylene as a main component from the viewpoint of heat resistance.
As shown in fig. 2, the container body 20 integrally includes a cup portion 24 and an annular flange portion 25, the cup portion 24 is open upward, and the annular flange portion 25 is integrally formed at an upper end edge of the cup portion 24 and extends toward the outer peripheral side.
As shown in fig. 2 and 3, an annular step portion 26 is formed on the upper surface of the flange portion 25 along the entire circumference in the flange circumferential direction so that the inner circumferential side thereof is located below the outer circumferential side.
As shown in fig. 3, the first container layer 21, which is the uppermost layer of the container body 20, is formed with the step portion 26: an outer peripheral portion 21a formed on the outer peripheral side of the stepped portion 26, and an inner peripheral portion 21b formed on the inner peripheral side of the stepped portion 26 and formed below the outer peripheral portion 21 a.
As shown in fig. 2 and 4, the lid body 30 is thermally bonded to at least a part (the entire region in the present embodiment) of the upper surface of the outer peripheral portion 21a of the first container layer 21, and the lid body 30 is not thermally bonded to the upper surface of the inner peripheral portion 21b of the first container layer 21.
As shown in fig. 3, the second container layer 22 also has, by forming the step portion 26: an outer peripheral portion 22a formed on the outer peripheral side of the stepped portion 26, and an inner peripheral portion 22b formed on the inner peripheral side of the stepped portion 26 and formed below the outer peripheral portion 22 a.
In the present embodiment, the lid 30 is not thermally bonded to the upper surface of the inner peripheral portion 21b of the first container layer 21, but the lid 30 may be thermally bonded to the upper surface of the inner peripheral portion 21b, and in this case, the adhesion between the lid 30 and the inner peripheral portion 21b is preferably set to be weaker than the adhesion between the lid 30 and the outer peripheral portion 22a, more specifically, it is preferably set to: when a pressure of 20kPa or less is applied to the inside of the content storage section 11, the bonded portion between the lid body 30 and the inner peripheral portion 21b is peeled off. By setting as described above, at the time of heating, the thermal bonding portion between the lid body 30 and the inner peripheral portion 21b can be peeled off by the increase of the vapor pressure in the content housing portion 11, and interlayer peeling between the first container layer 21 and the second container layer 22 can occur from the boundary exposed portion 28 described later.
As shown in fig. 3, the height difference t between the outer peripheral portion 21a and the inner peripheral portion 21b of the first container layer 21 is preferably set to 70 to 250 μm. When the height difference t is 70 μm or more, the steam in the content storage portion 11 can be reliably caused to enter between the inner peripheral portion 21b and the lid body 30 during heating, and when the height difference t is 250 μm or less, excessive deformation or cracking of the flange portion 25 can be suppressed when the stepped portion 26 is formed.
As shown in fig. 3, a cut portion 27 obtained by cutting the first container layer 21 (at least to the boundary between the first container layer 21 and the second container layer 22) is formed in the step portion 26, and as a result, a boundary exposed portion 28 as a boundary between the first container layer 21 and the second container layer 22 is formed in the step portion 26.
As shown in fig. 3, the boundary exposed portion 28 is exposed to the content storage portion 11 (more specifically, exposed when viewed from the inside of the container), and functions as an opening on the content storage portion 11 side of the steam passage 29 formed between the first container layer 21 and the second container layer 22 when heated.
It is preferable that the depth d of the cut portion 27 is set to be larger than the step t, and by setting the depth d to be larger than the step t, the boundary exposed portion 28 which is the boundary between the first container layer 21 and the second container layer 22 can be reliably exposed.
The lid body 30 is made of synthetic resin or the like, and as shown in fig. 1, has an unsealing grip 31 located on the outer peripheral side of the heat-sealed portion 40 and on the outer peripheral side of the flange portion 25. The unsealing grip 31 is a portion to be gripped by a user when unsealing the lid body 30, and is formed on the opposite side of a later-described irregularly-shaped seal portion 42 so as to sandwich the center of the container.
This makes it possible to peel off the peripheral portion of the irregularly shaped seal portion 42, which may make peeling of the lid body 30 difficult due to formation of the arch-shaped deformation portion 21c, as described later, at the end, and therefore, it is possible to suppress a decrease in the unsealing property of the lid body 30.
From the viewpoint of forming the arch-shaped deformed portion 21c described later satisfactorily, the adhesion strength between the lid body 30 and the first container layer 21 is preferably set to be higher than the adhesion strength between the other layers (in the present embodiment, the adhesion strength between the first container layer 21 and the second container layer 22, and the adhesion strength between the second container layer 22 and the third container layer 23).
In addition, from the viewpoint of forming the later-described arch-shaped deformed portion 21c satisfactorily, the adhesion strength between the first container layer 21 and the second container layer 22 is preferably set to be lower than the adhesion strength between the other layers (in the present embodiment, the adhesion strength between the lid body 30 and the first container layer 21, and the adhesion strength between the second container layer 22 and the third container layer 23).
The heat seal portion 40 is a portion for thermally bonding the lower surface of the lid body 30 and the upper surface of (the outer peripheral side portion 21a of) the first container layer 21, and as shown in fig. 1, the heat seal portion 40 includes: an annular seal portion 41 formed to surround the content storage portion 11 when viewed from above; a special-shaped seal portion 42 protruding from the inner peripheral edge of the annular seal portion 41 toward the inner peripheral side; and a pair of control seal portions 43 formed on both sides of the shaped seal portion 42 in the flange circumferential direction, respectively.
As shown in fig. 1 and 5, the shaped seal portion 42 is formed by: when viewed from above, the inner peripheral edge of the outer peripheral edge reaches or approaches the boundary exposed portion 28. By disposing the inner peripheral edge of the shaped seal portion 42 so as to contact or approach the stepped portion 26 in this manner, peeling of the first container layer 21 and the second container layer 22 can occur in the shaped seal portion 42 due to an increase in the internal pressure of the content housing portion 11, and therefore, peeling of the first container layer 21 and the second container layer 22, peeling of the lid body 30 from the flange portion 25, and the like can be suppressed from occurring at a position other than a predetermined position.
As shown in fig. 1 and 5, the control seal portion 43 is formed by: the irregular seal portion 42 is opposed to the lid body 30 in the flange circumferential direction so as to sandwich the unsealed portion 44 where the lid body is not thermally bonded to the flange portion 25.
The control seal portion 43 is formed to be continuous with the annular seal portion 41 in the flange radial direction, and the unsealed portion 44 communicates with the content storage portion 11.
The innermost end of the control seal portion 43 in the flange radial direction is set at a position radially outward of the flange of the modified seal portion 42 in the flange radial direction. However, the control seal portion 43 may be formed such that the innermost end of the control seal portion 43 in the flange radial direction is positioned further inward in the flange radial direction than the innermost end of the irregularly shaped seal portion 42 in the flange radial direction.
Next, the state of each part when the container 10 for a microwave oven of the present embodiment is heated will be described below.
First, when the container 10 for a microwave oven is heated by a microwave oven, the contents in the contents storage 11 are heated to generate steam, and the internal pressure in the container 10 for a microwave oven is increased.
Then, as the internal pressure in the container 10 for a microwave oven increases, as is apparent from fig. 4 to 6, the deformed seal portion 42 causes peeling at the boundary exposed portion 28 between the first container layer 21 and the second container layer 22, and as the peeling between the first container layer 21 and the second container layer 22 progresses, the steam passage 29 extending in the radial direction of the flange portion 25 is formed between the first container layer 21 and the second container layer 22, and as shown in fig. 4, the steam in the content housing portion 11 is discharged to the outside from the space between the first container layer 21 and the second container layer 22 at the outer peripheral edge of the flange portion 25 through the steam passage 29.
Here, in the present embodiment, since the steam in the container 10 for a microwave oven is discharged to the outside through the steam passage 29 formed between the first container layer 21 and the second container layer 22, the first container layer 21 is deformed into an arch shape by the pressure and heat of the steam passing through the steam passage 29, and as shown in fig. 6, an arch-shaped deformed portion 21c is formed in the first container layer 21.
In addition, in the present embodiment, even after the steam inside the container for a microwave oven 10 is exhausted, the steam passage 29 is maintained between the first container layer 21 and the second container layer 22 by the arch-shaped deformation portion 21c formed in the first container layer 21, and therefore, when the temperature of the container for a microwave oven 10 is lowered after the heating of the container for a microwave oven 10, the external atmosphere can be introduced into the container for a microwave oven 10 through the steam passage 29, and thus, the deformation of the container for a microwave oven 10 can be avoided.
In order to form the arch-shaped deformation portion 21c satisfactorily, the thickness of the first container layer 21 is preferably set to 40 to 200 μm.
In order to form the arch-shaped deformed portion 21c satisfactorily, the first container layer 21 preferably has a tensile ratio (JIS K7161) of 100% or more.
Further, the width dimension in the flange circumferential direction of the irregularly shaped seal portion 42 is preferably set to 4mm or more.
Next, the effect of forming the control seal portion 43 and the non-seal portion 44 on both sides of the deformed seal portion 42 in the flange circumferential direction and the state of each portion when the container 10 is heated by the microwave oven will be described in detail below.
First, when the internal pressure in the content storage part 11 rises, as shown in fig. 6, steam pressure is applied to the unsealed part 44 located on both outer sides of the irregularly shaped sealed part 42 in the flange circumferential direction, so that the unsealed part 44 expands, and peeling between the first container layer 21 and the second container layer 22 starts at the boundary exposed part 28, and as the internal pressure of the container 10 for a microwave oven rises, peeling between the first container layer 21 and the second container layer 22 progresses toward both outer sides in the flange circumferential direction and the flange radial direction outer side.
At this time, as shown in fig. 6, since pressing forces due to the steam pressure applied to the unsealed portion 44 from both outer sides in the flange circumferential direction are applied to the steam passage 29, and the separation of the first container layer 21 and the second container layer 22 is suppressed from progressing to both outer sides in the flange circumferential direction (that is, the expansion of the steam passage 29 in the flange circumferential direction), the separation between the first container layer 21 and the second container layer 22 in the flange circumferential direction can be suppressed, and the separation can be made toward the outer sides in the flange circumferential direction.
In the present embodiment, the final shape of the steam passage 29 formed as described above is a tapered shape as it goes to the outer side in the flange circumferential direction as shown in fig. 8 (a).
In order to satisfactorily exhibit the effect of preventing the expansion of the steam passage 29 by the expansion of the unsealed portion 44, it is preferable to control the sealed portion 43 and the unsealed portion 44 as follows.
First, as shown in fig. 7, the depth dimension D1 of the unsealed portion 44 (i.e., the dimension D1 from the innermost end of the control seal portion 43 in the flange radial direction to the annular seal portion 41 in the direction parallel to the virtual line L passing through the center of the deformed seal portion 42 in the flange circumferential direction and extending in the flange radial direction) is preferably set to 1mm or more and 50% or less of the width dimension D2 of the flange portion 25 in the above-described direction. That is, if the dimension D1 is set small, the effect of preventing the steam passage 29 from expanding due to the expansion of the unsealed portion 44 cannot be sufficiently obtained, and if the dimension D1 is set large, the width of the annular seal portion 41 in the flange radial direction cannot be sufficiently secured, and the sealing performance is lowered.
As shown in fig. 7, the angle α defined by the intersection of the virtual line L and the outer edge of the flange portion 25 and the end portion of the innermost end of the pair of left and right control seal portions 43 on the side of the deformed seal portion 42 is preferably set within a range of 60 ° to 150 °, and more preferably within a range of 80 ° to 130 °. That is, if the angle α is set small, the force pressing the steam passage 29 from the flange circumferential direction by the expansion of the unsealed portion 44 cannot be sufficiently obtained, and if the angle α is set large, the steam passage 29 is formed up to the outer peripheral edge of the flange portion 25 before the force pressing the steam passage 29 by the expansion of the unsealed portion 44 is sufficiently exerted.
For the same reason, the distance (maximum separation distance) W between the deformed seal portion 42 and the control seal portion 43 in the flange circumferential direction is preferably set to be in the range of 4 to 20 mm.
Next, an experiment performed to confirm the effect of controlling the formation of the seal portion 43 will be described below with reference to fig. 8.
First, in this experimental example, test pieces 1 to 4 shown in fig. 8 were prepared, 50cc of water was put into each test piece, and heated in a microwave oven set at 600W until steam was discharged to the outside of the container, and the state of the formed steam passage 29 and the presence or absence of a popping sound at the time of steam discharge were confirmed.
The test pieces 1 to 4 were formed under the same conditions except for controlling the shape, position, and presence/absence of the seal portion 43, specifically, each test piece was formed in a container shape having a diameter of 78mm, a flange radial width of 7mm, and a volume of 65cc, and the lid body 30 was thermally bonded to the flange portion 25 under conditions of 175 ℃, 120kgf/cup, and 1.5 sec.
From this experimental example, it can be seen that: the test pieces 1 to 3 formed with the control seal portion 43 can suppress the expansion of the steam passage 29 and prevent the occurrence of a plosive sound. The formation state of the steam passage 29 was confirmed to be good.
Note that the opening O (OK) in the table shown in fig. 8 means: as shown in an example of fig. 8 (a), the steam passage 29 is favorably formed, and the opening x means: as shown in an example of fig. 8 (b), the steam passage 29 is formed to expand in the circumferential direction of the flange portion 25.
Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes may be made without departing from the present invention described in the claims.
For example, in the above-described embodiment, the case where the content of the container 10 for a microwave oven is a food has been described, but the content of the container 10 for a microwave oven is not limited to a food.
In the above-described embodiment, the case where the container body 20 is formed of the 3-layer structure including the first container layer 21 as the sealant layer, the second container layer 22 as the intermediate layer, and the third container layer 23 as the base layer has been described, but the specific form of the container body 20 is not limited to the above-described form, and may be formed of a structure having at least 2 layers (the first container layer 21 and the second container layer 22), and for example, the container body 20 may be formed of a 2-layer structure including the first container layer 21 formed as the sealant layer and the second container layer 22 formed as the base layer. In the case where an intermediate layer (softened resin layer) made of polyethylene, ethylene copolymer, or the like is provided as in the above-described embodiment, the steam removability of removing steam from the boundary exposed portion 28 between the first container layer 21 and the second container layer 22 is improved, which is preferable.
In the above-described embodiment, as shown in fig. 6, the case where the arch-shaped deformed portion 21c is formed in the first container layer 21 has been described, but the container 10 for a microwave oven may be configured such that the arch-shaped deformed portion 21c is formed in at least one of the first container layer 21 and the second container layer 22.
In a specific embodiment of the control seal portion 43 and the unsealed portion 44, the control seal portion 43 may be opposed to the irregularly-shaped seal portion 42 in the flange circumferential direction so as to sandwich the unsealed portion 44, and may be any of the embodiments shown in fig. 9 (a) to 9 (c).
In the above-described embodiment, the case where the control seal portion 43 is formed so as to be continuous with the annular seal portion 41 in the flange radial direction as shown in fig. 1 and the like has been described, but the control seal portion 43 may be formed at a position separated from the annular seal portion 41 in the flange radial direction independently as shown in fig. 9 (d). In this case, it is preferable to set the maximum separation distance in the flange radial direction between the control seal portion 43 and the annular seal portion 41 to 4mm or less in order to suppress the vapor pressure from being released from the gap between the control seal portion 43 and the annular seal portion 41.
In addition, in the above-described embodiment, the case where the shape of the shaped seal portion 42 is rectangular was described, but the specific shape of the shaped seal portion 42 may be any shape such as a shape in which a step is formed on the side portion in the flange circumferential direction as shown in fig. 9 (f).
In the above-described embodiment, the case where the stepped portion 26 (the cut portion 27, the boundary exposed portion 28) is formed over the entire circumference in the flange circumferential direction as shown in fig. 1 and the like has been described, but the stepped portion 26 (the cut portion 27, the boundary exposed portion 28) may be formed only in a partial region in the flange circumferential direction as shown in fig. 10 a. In this case, the width dimension in the flange circumferential direction of the boundary exposure portion 28 is preferably set to be longer than the width dimension in the flange circumferential direction of the shaped seal portion 42, and the boundary exposure portion 28 is preferably formed over the entire range in which both outer sides in the flange circumferential direction exceed both ends of the shaped seal portion 42 in the flange circumferential direction, whereby the arch-shaped deformation portion 21c shown in fig. 6 can be favorably formed. In addition, as in the above-described embodiment, when the step portion 26 (the cut portion 27, the boundary exposed portion 28) is formed over the entire circumference in the flange circumferential direction, it is not necessary to perform positioning in the circumferential direction of the container body 20 and the lid body 30 when the lid body 30 is thermally bonded to the container body 20.
In the above-described embodiment, the case where the flange portion 25 is formed in an annular shape as shown in fig. 1 has been described, but the specific shape of the container body 20 is not limited to the above-described shape, and may be any shape such as a substantially rectangular annular shape as shown in fig. 10 (b) and 10 (c), for example.
In the example shown in fig. 10 (b) and 10 (c), the flange portion 25 is formed in a substantially polygonal shape (in the example shown in fig. 10, a rectangular shape or a rectangular ring shape), and includes, when viewed from above: a plurality of (4 in the example shown in fig. 10) side portions 25a having an inner peripheral edge extending linearly, and a corner portion 25b having an R-shaped inner peripheral edge connecting the side portions 25a to each other. In the example shown in fig. 10 (b), the irregular shaped seal portion 42 is formed continuously with the portion formed on the side portion 25a in the annular seal portion 41, and in the example shown in fig. 10 (c), the irregular shaped seal portion 42 is formed continuously with the portion formed on the corner portion 25b in the annular seal portion 41. As shown in fig. 10 (c), it is more preferable to form the steam passage 29 stably in the case where the irregular-shaped sealing portion 42 is formed in the vicinity of the corner portion 25b where pressure due to steam generated in the content storage portion 11 is likely to be applied when heating is performed in a microwave oven.
In the above-described embodiment, the case where the step portion 26 (cut portion 27) is formed in the flange portion 25 to form the boundary exposed portion 28 as the boundary between the first container layer 21 and the second container layer 22 as shown in fig. 3 has been described, but the boundary exposed portion 28 may be formed without forming the step portion 26 as shown in fig. 11.
As shown in fig. 11, specific examples of a method for forming the boundary exposed portion 28 without forming the stepped portion 26 include: after molding the container body 20 having a multilayer structure, a part of the flange portion 25 is removed by a heated blade or the like; or a container body 20 having a multilayer structure is molded so as to form a portion where a boundary portion between layers of the flange portion 25 corresponding to the boundary exposed portion 28 is exposed (for example, a sheet having a 2-layer structure of the first container layer 21 and the second container layer 22 is bonded to the flange portion 25 of the container body 20 having the third container layer 23).
In the case of the example shown in fig. 11, the first container layer 21 does not need to be the uppermost layer in the multilayer structure of the container body 20, and for example, the layer below the uppermost layer may be the first container layer 21.
In the above-described embodiment, the case where the steam having entered the steam passage 29 during heating in the microwave oven is discharged to the outside from the space between the first container layer 21 and the second container layer 22 at the outer edge of the flange portion 25 as shown in fig. 4 has been described. However, the specific form of the container 10 for a microwave oven is not limited to the above form, and for example, as shown in fig. 12, it may be configured such that: a through hole 29a penetrating from the upper surface to the lower surface of the flange portion 25 is formed, and the steam entering the steam passage 29 from the boundary exposed portion 28 is discharged to the outside from the through hole 29 a. When the through-hole 29a is formed, it is preferable that a part or the whole of the through-hole enters the irregularly shaped seal portion 42 as shown in fig. 12 (a) from the viewpoint of steam removal performance. The through hole 29a is preferably arranged radially outward of the control seal portion 43.
In the above-described embodiment, the case where the boundary exposure portion 28 is exposed to the content storage portion 11 in the state before heating has been described, but the boundary exposure portion 28 may be exposed to the content storage portion 11 at least during heating, and may be configured such that: the boundary exposure portion 28 is covered with the lid 30 or the resin material of the first container layer 21 in a state before heating, and the resin material peels off as the vapor pressure in the content storage portion 11 increases, and delamination between the first container layer 21 and the second container layer 22 starts from the boundary exposure portion 28.
Description of the symbols
Container for microwave oven
11. Content storage section
20. Container body
21. First container layer
21 a. Outer peripheral part
21b. Inner peripheral side part
21c. Arch-shaped deformation part
22. Second container layer
22 a. Outer peripheral part
22b. Inner peripheral side portion
23. Third container layer
24. Cup
25. Flange part
26. Step part
27. Cutting part
28. Boundary exposure part
29. Steam path
29a · through hole
30. Lid
31 · unsealing grip part
40. Heat seal part
41. Annular seal
42. Special-shaped sealing part
43. Control seal
44. Unsealed part
Claims (5)
1. A container for a microwave oven, comprising a lid body thermally bonded to a flange portion of a container body formed of a multilayer structure including a first container layer and a second container layer adjacent to each other through a heat seal portion, wherein steam in a content storage portion is discharged through a steam passage formed between the first container layer and the second container layer during heating,
the container for a microwave oven is characterized in that,
a boundary exposed portion that is a boundary between the first container layer and the second container layer and is exposed to the content storage portion at least when heated is formed in the flange portion,
the heat seal portion has: an annular seal portion formed to surround the content storage portion when viewed from above; a special-shaped seal portion that protrudes from an inner peripheral edge of the annular seal portion toward an inner peripheral side; and control seal portions formed on both sides of the irregularly shaped seal portion in the flange circumferential direction, respectively,
the special-shaped sealing part is formed by: the inner periphery of the outer frame reaches or approaches the boundary exposed part when viewed from above,
the control seal portion is opposed to the deformed seal portion in the flange circumferential direction so as to sandwich an unsealed portion where the lid body is not thermally bonded to the flange portion, and an inner peripheral edge of the control seal portion is formed further inward in the flange radial direction than an inner peripheral edge of the annular seal portion in the unsealed portion.
2. A container for a microwave oven according to claim 1,
the control seal portion is formed such that: and is continuous with the annular sealing part in the radial direction of the flange.
3. The container for a microwave oven according to claim 1 or 2,
a step portion formed in at least a partial region in a flange circumferential direction is provided on an upper surface of the flange portion,
the first container layer is the uppermost layer in the multilayer structure of the container main body, and has: an outer peripheral portion formed on an outer peripheral side of the stepped portion and thermally bonded to the lid body, and an inner peripheral portion formed on an inner peripheral side of the stepped portion and formed lower than the outer peripheral portion,
the boundary exposed portion is formed on the stepped portion.
4. A container for a microwave oven according to claim 3,
the lid body is also thermally bonded to a part of the inner peripheral side portion in a state before heating,
the adhesion between the lid and the inner peripheral side portion is weaker than the adhesion between the lid and the outer peripheral side portion.
5. The container for a microwave oven according to any one of claims 1 to 4,
the flange portion is formed in a shape having a plurality of side portions and corner portions connecting the side portions,
the shaped seal portion is continuous with a portion of the annular seal portion formed on the corner portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-075729 | 2019-04-11 | ||
| JP2019075729 | 2019-04-11 | ||
| PCT/JP2019/044910 WO2020208856A1 (en) | 2019-04-11 | 2019-11-15 | Oven container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113614004A CN113614004A (en) | 2021-11-05 |
| CN113614004B true CN113614004B (en) | 2022-11-04 |
Family
ID=72751012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980090731.0A Active CN113614004B (en) | 2019-04-11 | 2019-11-15 | Container for microwave oven |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113614004B (en) |
| WO (1) | WO2020208856A1 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3240236B2 (en) * | 1994-03-18 | 2001-12-17 | 住友ベークライト株式会社 | Food packaging for microwave cooking |
| JP2004345686A (en) * | 2003-05-22 | 2004-12-09 | Lining Container Kk | Easy-openable container |
| JP4242872B2 (en) * | 2006-02-06 | 2009-03-25 | 株式会社サンエー化研 | How to open a microwave packaging container |
| US7582340B2 (en) * | 2006-04-06 | 2009-09-01 | Packs Co., Ltd | Container for retort pouch food |
| DE102006017834A1 (en) * | 2006-04-13 | 2007-10-18 | Cfs Kempten Gmbh | A microwaveable packaging |
| JP4888644B2 (en) * | 2006-05-19 | 2012-02-29 | 東洋製罐株式会社 | Packaging for microwave oven cooking |
| US20160176613A1 (en) * | 2014-12-18 | 2016-06-23 | Kuo Hsiang Tzu | Pressure auto-adjusting package for heated food and a composite membrane thereof |
| JP6595941B2 (en) * | 2016-03-23 | 2019-10-23 | 東罐興業株式会社 | Range container |
| JP2019038552A (en) * | 2017-08-23 | 2019-03-14 | 日清食品ホールディングス株式会社 | Packaging container |
-
2019
- 2019-11-15 CN CN201980090731.0A patent/CN113614004B/en active Active
- 2019-11-15 WO PCT/JP2019/044910 patent/WO2020208856A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020208856A1 (en) | 2020-10-15 |
| CN113614004A (en) | 2021-11-05 |
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